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28.02.2016 - 16:54

Q.com article in the „Physik in unserer Zeit“

A recent open-access article by research partners from the BMBF Q.com Research Network project entitled "Sichere Kommunikation per Quantenrepeater" is published in "Physik in unserer Zeit", which reports on the current state and the main challenges in this field.

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12.12.2015 - 12:00

3rd OCL-TP Workshop

On 10-11th December, the 3rd International Workshop between the "Optical Communication Lab" and the Department "Technological Physics" took place under framework of long-term cooperation agreement between the Israel Institute of Technology and the University of Kassel.

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23.07.2015 - 16:54

OCL-TP Workshop

On 22-23rd July, the 2nd International Workshop between the "Optical Communication Lab" and the Department "Technological Physics" took place under framework of long-term cooperation agreement between the Israel Institute of Technology and the University of Kassel.

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INA - Technological Physics > Education > Courses > Semiconductor laser

Semiconduction lasers: Basics and actual research (SS)

Lecturer: Prof.Dr. Johann-Peter Reithmaier

Content of the lectures

The lectures consist of 4 SWh. (lectures and exercises). The lectures are suitable for students from 5 semester of "Nanostructure Science Course" (obligatory elective cource b/d, b/e, b/f) and "Physics Diploma" (elective cource S-Schein). Basic knowledge of Solid State Physics like "Introduction to the experimental physics IV" or "Applied semiconductor physics" are required.
The lectures present the fundamentals of laser physics based on semiconductor lasers and goes deeper into the current research of the laser device. The following topics will be discussed in the basic part of the lectures:

* spontaneous and stimulated emission
* spectral amplification
* threshold conditions
* Fabry-Perot resonator
* layers and core of the waveguide
* feedback and bragg grating
* theory of coupled modes
* transfer matrix theory
* high frequency properties (modulation properties, resonance frequency, chirp and line thickness)

The application area of the semiconductor lasers in the last 10 years was immensely broadened. It leads to mutiplicity of new applications and application possibilities, which will be discussed during the lectures and in the special topics of the seminar presentations. Among other things the nano-structuring methods for material and component structuring will be heightened in the future. Among other the following will be discussed:

* vertical emitting laser (VCSEL)
* disc and ring lasers
* microaser
* quantum dot laser
* UV-laser based on GaInN
* quantum cascade laser
* laser based on photonic crystals
* single photon source

In the lectures will be discussed also basic principles of the devices, fabrications methods and possible applications.

Lecture and eximination dates


Lecture times SS 2017:


Monday, 9:00 - 11:00, R 1135

Thursday, 9:00 - 11:00, R 1252

First lecture: 20.04.2017


Oral Exams
: Thursday, 05.10.2017



A list for individual examination dates will be provided in the lecture of Mr. Reithmaier.

Vorträge und Handouts

Vorträge und Handouts

Marco Künne, "Light sources for quantum information prosessing" (Vortrag, Handout)

Frederic Franz, "THz sources (quantum cascade lasers, two-wavelength mixing)" (Vortrag, Handout)

Huda Otto, "Semiconductor lasers for medical applications" (Vortrag, Handout)
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